Overview
A control’s data must define at least the following items:
Input, Output or Feature Main items.
Usage Local item.
9
Usage Page Global item.
Logical Minimum Global item.
Logical Maximum Global item.
Report Size Global item.
Report Count Global item.
Table 9-1 shows the representation of a Mouse Report descriptor content from a host HID
parser perspective. The mouse has three buttons (left, right and wheel). The code presented
in Listing 9-2 is an example of code implementation corresponding to this mouse Report
descriptor representation.
   
   
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8VDJH 
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8VDJH 
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8VDJH 0LQ 
EXWWRQ  
8VDJH 0D[ 
EXWWRQ  
/RJLFDO 0LQ 
 
/RJLFDO 0D[ 
 
,QSXW 5HSRUW
 FRQVWDQW 
5HSRUW
&RXQW   
5HSRUW 6L]H 
  
,QSXW 5HSRUW
 GDWD 
/RJLFDO 0LQ 
    
/RJLFDO 0D[ 
   
5HSRUW
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5HSRUW 6L]H 
 
8VDJH  ;
8VDJH  <
5HSRUW
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5HSRUW 6L]H 
 
    8VDJH 3DJH  %XWWRQ
    8VDJH 3DJH  *HQHULF 'HVNWRS
    8VDJH 3DJH  *HQHULF 'HVNWRS
Figure 9-1 Report Descriptor Content from a Host HID Parser View
139
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